Carbon Fiber Adjustable Cranks

These second generation prototype cranks were used for about 250 miles of use on a Coke, of which about 5 miles was offroad and included many 1+' drop-offs on rock. They were mostly used at approx 140mm, but also at 155mm and a little at 125mm. While a nice design with made well, they just aren't quite strong enough to hold up to unicycling for me.